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Paul Eggert eggert at cs.ucla.edu
Thu May 21 20:33:41 UTC 2020

On 5/21/20 9:18 AM, Brian Inglis wrote:

> System.out.println(java.time.zone.ZoneRulesProvider.getVersions("UTC").keySet());
> [2019c]

Thanks for that jshell recipe. I observe the same "2019c" on my Ubuntu 
18.04.4 laptop, even though Ubuntu 18.04.4 has updated tzdata to 2020a, 
as can be seen from this shell command:

$ zdump -V -c 2020,2021 America/Dawson
America/Dawson  Sun Mar  8 09:59:59 2020 UT = Sun Mar  8 01:59:59 2020 
PST isdst=0 gmtoff=-28800
America/Dawson  Sun Mar  8 10:00:00 2020 UT = Sun Mar  8 03:00:00 2020 
MST isdst=0 gmtoff=-25200

So I am observing the same symptoms that Sundar Sarma reports: my tzdata 
package is up-to-date but its Java copy is not.

There are recipes for fixing the problem by updating the Java copy. For 
Oracle Java, see 
For OpenJDK or some other Java, you can try ZIUpdater 
tzdbgen <https://github.com/akashche/tzdbgen>, and/or IANA Updater 
<https://bell-sw.com/pages/iana-updater/>. I'm not going to bother to 
run any of those since I don't normally run Java apps on my laptop.

This Java stuff is all downstream from the tz project proper, so those 
who have problems with it should contact whoever's maintaining the Java 
software they're using.

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